Amount of Insulation

The amount of insulation required for various parts of houses can be found in the 1995 National Energy Code for Houses (NECH). The amount of insulation is related to the severity of the climate as categorized in zones for each province, and the cost of space heating fuel. The zones in each province are established using the degree-day method. Degree-days are calculated for a given location by accumulating the differences between 64°f (i8°C) and the mean temperature for every day in the year when the mean temperature is below 64°F (i8°C). Degree-day values for a number of locations in Canada are listed in the

National Building Code.

It should be recognized that the R-values (RSI values) required in the NECH are minimum effective thermal resistance values. Effective thermal resistance values are different than nominal thermal resistance values in that the former take into account thermal bridging through framing members, whereas the latter relate to the sum of installed insulation R-values (RSI values). The minimum required effective thermal resistance value in the NECH are indeed mini-mums. In many cases, it is worth considering higher R-values (RSI values) when building a new house. It is much easier to incorporate extra insulation when building, than to add it afterwards.

All walls, floors and ceilings which separate heated space from unheated space or the outside air should be insulated. Foundation walls separating heated basements or crawl spaces from the outside air or soil should also be insulated to at least 24 in. (600 mm) below grade level on the inside of the basement, or full height on the outside. Methods of insulating these different areas are given in the following sections. The figures illustrate a number of possible methods of insulating building elements. It is not intended to imply that these are the only acceptable methods. Specific materials, thicknesses and spacings are shown in the illustrations in order to correlate these with their effective thermal resistance values. In most cases, the material, thickness or spacing illustrated is only one of a number of equally acceptable alternatives. However, if elements other than those

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